Giant submarine landslide in the South China Sea: Evidence, causes and implications
Published in Journal of Marine Science and Engineering, 2019
This paper highlights the discovery of the giant Baiyun-Liwan submarine slide in the South China Sea, underscoring its significant scale and potential implications for regional geohazards and geological processes.
Abstract
Submarine landslides can be tremendous in scale. They are one of the most important processes for global sediment fluxes and tsunami generation. However, studies of prodigious submarine landslides remain insufficient. In this review paper, we compile, summarize, and reanalyze the results of previous studies. Based on this reanalysis, we discover the giant Baiyun–Liwan submarine slide in the Pearl River Mouth Basin, South China Sea. We describe three concurrent pieces of evidence from ~23 Ma to 24 Ma, the Oligocene–Miocene boundary, for this landslide: the shoreward shift of the shelf break in the Baiyun Sag, the slump deposition to the southeast, and the abrupt decrease in the accumulation rate on the lower continental slope. This landslide extends for over 250 km, and the total affected area of the slide is up to ~35,000–40,000 km^2. The scale of the landslide is similar to that of the Storegga slide, which has long been considered to be the largest landslide on earth. We suggest that strike–slip movement along the Red River Fault and ridge jump of the South China Sea caused the coeval Baiyun–Liwan submarine slide. The identification of the giant landslide will promote the understanding of not only its associated geohazards but also the steep rise of the Himalayan orogeny and marine engineering. More attention needs to be paid to areas with repeated submarine landslides and offshore installations.
Keywords
giant submarine landslides; shelf break; South China Sea; Himalayan orogeny; repeated submarine landslides
Featured in Geology Today
This paper is featured in Geodigest of Geology Today, published on behalf of The Geologists’ Association and The Geological Society of London.
Geodigest-World’s Largest Landslide. Geology Today, 35(4), 122-134. http://doi.org/10.1111/gto.12277
Recommended citation: Zhu, C., Cheng, S., Li, Q., Shan, H., Lu, J., Shen, Z., Liu, X., & Jia, Y. (2019). Giant Submarine Landslide in the South China Sea: Evidence, Causes and Implications. Journal of Marine Science and Engineering, 7(5), 152 http://doi.org/10.3390/jmse7050152